Boston Banana Cream Pie

This is really a scrumptious sponge cake, thickly filled with a pastry cream (crème pâtissière) and banana slices and glazed with chocolate. Its origins can be traced back to cake-pies, which are cake batters baked in pie crusts. Often, as in this case, the pie crust was omitted and the batter was baked in a pie or cake tin. It has remained one of America’s favourite desserts. The cake can be made in advance, wrapped so it is airtight and frozen. The cream filling can be made one day